The truth, the real truth is no one can prove legal ownership of the kickstart roms. If someone could, they would have done so. Instead, each time this question comes up, the amiga grave robbers still profiting from selling these ancient rom files are deadly silent.
I'm glad the aros kickstart roms will soon end this bull****. I hope they will continue to improve and provide a level of compatibility that will mean the old actual amiga kickstart roms are no longer needed.
I don't believe the pi has enough horsepower to adequately emulate an amiga without alot of dropped frames, skipping sound and so forth, but I could be wrong... If there was an optimized aros distro just for PI, it may be able to emulate classic apps without problems, but I'm not sure it would deal well with very demanding aga games and so on...